231556225 has 6 divisors (see below), whose sum is σ = 287129750. Its totient is φ = 185244960.

The previous prime is 231556207. The next prime is 231556231. The reversal of 231556225 is 522655132.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 35892081 + 195664144 = 5991^2 + 13988^2 .

It is not a de Polignac number, because 231556225 - 2²³ = 223167617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4631100 + ... + 4631149.

Almost surely, 2^231556225 is an apocalyptic number.

231556225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231556225 is a deficient number, since it is larger than the sum of its proper divisors (55573525).

231556225 is an equidigital number, since it uses as much as digits as its factorization.

231556225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9262259 (or 9262254 counting only the distinct ones).

The product of its digits is 18000, while the sum is 31.

The square root of 231556225 is about 15216.9716106721. The cubic root of 231556225 is about 614.0713284562.

The spelling of 231556225 in words is "two hundred thirty-one million, five hundred fifty-six thousand, two hundred twenty-five".